VLC -- Free (GPL) cross-platform media player/streamer with support for a large number of formats and more.

Koha Open Source ILS -- Full-featured Library Automation System, including OPAC, Circulation/Borrower Management, Budget-based Acquisitions, Serials Management, and Reporting/Administrative modules. MARC21 and UNIMARC are supported. Advanced search capabilities, integrated Z39.50 server and client, and self-checkout. Commercial Installation and Support available worldwide from : LibLime. Hundreds of libraries of all sizes and types are using Koha worldwide. The system can support very large collection sizes (tens of millions of records) and is very easy to customize as it's written in Perl, MySQL and uses the Zebra indexing engine for searching.

Open Journals System OJS assists with every stage of the refereed publishing process, from submissions through to online publication and indexing.

Prospero An Open Source Internet Document Delivery (IDD) System (The Ohio State University).

Google Docs & Spreadsheets A web browser-based word processor & spreadsheet application based on the Writely beta product that Google acquired in 2006. With this application, you can publish a document or spreadsheet online. It also allows you to collaborate with anyone who has access to a web browser. You can invite other people to read or edit your document by entering their e-mail addresses on a form.